This optional task explains how to configure the maximum numbers of equal-cost paths that IPv6 RIP will support, adjust the IPv6 RIP timers and originate a default IPv6 route.
The corresponding commands are either entered in the configuration context of IPv6 RIP routing processes or applied to specific interfaces in their configuration contexts.
The optional command for defining the maximum number of equal-cost routes that IPv6 RIP can support applies to the whole routing process:
Router(config-router)# maximum-paths number-paths
The number-paths argument is an integer from 1 to 4. The default for RIP is 4 paths.
RIP update times are also relevant for the routing process in general. By default, updates occur every
30 seconds and timeout after 180 seconds, hold-down lasts 0 seconds and garbage collection is
activated after 120 seconds. To change these values use the following command:
Router(config-router)# timers update timeout holddown garbage-collection
To originate the IPv6 default route (::/0) into the updates of a specified RIP routing process from a specified interface enter the following command in the configuration context of that interface:
Router(config-if)# ipv6 rip name default-information {only | originate}
Note: To avoid routing loops after the IPv6 default route (::/0) is originated out of any interface, the routing process ignores all default routes received on any interface.
Specifying the only keyword originates the default route (::/0) but suppresses all other routes in the updates sent on this interface.
Specifying the originate keyword originates the default route (::/0) in addition to all other routes in the updates sent on this interface.
Examples
a) This example shows how the RIP process is configured to support only one equal cost path:
Router(config-router)# maximum-paths 1
b) With the following command the update timer is reduced to 5 seconds, timeouts occur after 15 seconds while holddown lasts 10 seconds and garbage collection is activated after 30 seconds:
Router(config-router)# timers 5 15 10 30
c) In this example Ethernet interface 0/0 is configured to originate the IPv6 default route in addition to all other routes for IPv6 RIP process “ciscotest”:
Router(config)# interface Ethernet 0/0
Router(config-if)# ipv6 rip ciscotest default-information originate